The effect of a perturbation in the diameter of a circular microchannel on critical heat flux (CHF) is explored across a variety of predictive CHF correlations, and an optimum rate of diameter expansion is sought. It is demonstrated that a nonzero diameter expansion necessarily improves performance under several criteria for critical heat flux, and an optimum expansion parameter exists for many of these criteria. CHF relations are seen to follow a few distinct types, and those relations which contemplate effects which may directly influence CHF, such as pressure and phase velocity, tend to better reflect the experimentally demonstrated effect of the perturbation on the diameter of the microchannel.
- Heat Transfer Division
Effect of Cross-Sectional Perturbation on Critical Heat Flux Criteria in Microchannels
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Miner, MJ, & Phelan, PE. "Effect of Cross-Sectional Perturbation on Critical Heat Flux Criteria in Microchannels." Proceedings of the ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. Volume 1: Heat Transfer in Energy Systems; Theory and Fundamental Research; Aerospace Heat Transfer; Gas Turbine Heat Transfer; Transport Phenomena in Materials Processing and Manufacturing; Heat and Mass Transfer in Biotechnology; Environmental Heat Transfer; Visualization of Heat Transfer; Education and Future Directions in Heat Transfer. Rio Grande, Puerto Rico, USA. July 8–12, 2012. pp. 517-523. ASME. https://doi.org/10.1115/HT2012-58082
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